Fair Value of Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Aug. 06, 2019	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease/(Increase) in contingent consideration value	$ 0.8	$ (0.4)
Fair value adjustment of minority owned equity investment	$ 0.0	$ (2.3)
Myriad Development, Inc. & Insignificant Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration				$ 6.2
Myriad Development, Inc. & Insignificant Acquisition | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration				$ 20.5
National Tax Search LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration			$ 7.5